Maximilian, That's not a reasonable expectation. Mesh **isa** vtkPolyData, and not vice-versa. Look at docs for dynamic_cast in C++. In spirit, SafeDownCast is essentially the same thing.
Utkarsh On Wed, Aug 9, 2017 at 2:12 PM, Maximilian Weiherer < weiherer.maximil...@gmx.de> wrote: > Hi Utkarsh, > > > > thanks for your reply. I created the custom mesh class in order to add > some new functionality (e.g. a method to check whether a mesh intersects > another mesh). The vtkPolyData object which should be casted is the output > of a vtkSTLReader, i.e. > > Mesh* mesh = Mesh::SafeDownCast(reader->GetOutput()); // mesh always > equals NULL > > Best regards > > Maximilian > > > > *Von:* Utkarsh Ayachit [mailto:utkarsh.ayac...@kitware.com] > *Gesendet:* Mittwoch, 9. August 2017 17:53 > *An:* Maximilian Weiherer <weiherer.maximil...@gmx.de> > *Cc:* vtk <vtkus...@vtk.org> > *Betreff:* Re: [vtkusers] SafeDownCast does not work properly > > > > Maximilian, > > > > I am confused why any arbitrary vtkPolyData object would be castable to > "Mesh". It will only return non-null, if it's is indeed created as a Mesh. > Is it? Where's the "<vtkPolyData object>" coming from? > > > > Utkarsh > > > > On Wed, Aug 9, 2017 at 11:50 AM, Maximilian Weiherer < > weiherer.maximil...@gmx.de> wrote: > > Hi all, > > > > I defined my own mesh class (named *Mesh*) by inheriting from > vtkPolyData. Now I am struggling with the SafeDownCast method in order to > cast a vtkPolyData object into a *Mesh* object. Whenever I am applying a > SafeDownCast to a vtkPolyData object, NULL is returned. > > > > The *Mesh* class looks as follows: > > > > class Mesh : public vtkPolyData > > { > > public: > > static Mesh* New(); > > vtkTypeMacro(Mesh, vtkPolyData); > > void PrintSelf(ostream& os, vtkIndent indent); > > > > protected: > > Mesh(); > > ~Mesh(); > > private: > > Mesh(const Mesh&); // Not implemented. > > void operator=(const Mesh&); // Not implemented. > > }; > > > > …and this is the cast that does not work properly: > > > > Mesh* mesh = Mesh::SafeDownCast(<vtkPolyData object>); // mesh always > equals NULL > > > > Any help would be appreciated. Thanks! > > > > Best regards > > Maximilian > > > > [image: Das Bild wurde vom Absender entfernt.] > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > > Virenfrei. www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > > > _______________________________________________ > Powered by www.kitware.com > > Visit other Kitware open-source projects at http://www.kitware.com/ > opensource/opensource.html > > Please keep messages on-topic and check the VTK FAQ at: > http://www.vtk.org/Wiki/VTK_FAQ > > Search the list archives at: http://markmail.org/search/?q=vtkusers > > Follow this link to subscribe/unsubscribe: > http://public.kitware.com/mailman/listinfo/vtkusers > > >
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